Oxidative stress and apoptosis can disrupt the bone formation activity of osteoblasts which can lead to osteoporosis. This study was conducted to investigate the effects of γ -tocotrienol on lipid peroxidation, antioxidant enzymes activities, and apoptosis of osteoblast exposed to hydrogen peroxide (H 2O 2). Osteoblasts were treated with 1, 10, and 100 μ M of γ -tocotrienol for 24 hours before being exposed to 490 μ M (IC 50) H 2O 2 for 2 hours. Results showed that γ -tocotrienol prevented the malondialdehyde (MDA) elevation induced by H 2O 2 in a dose-dependent manner. As for the antioxidant enzymes assays, all doses of γ -tocotrienol were able to prevent the reduction in SOD and CAT activities, but only the dose of 1 μ M of GTT was able to prevent the reduction in GPx. As for the apoptosis assays, γ -tocotrienol was able to reduce apoptosis at the dose of 1 and 10 μ M. However, the dose of 100 μ M of γ -tocotrienol induced an even higher apoptosis than H 2O 2. In conclusion, low doses of γ -tocotrienol offered protection for osteoblasts against H 2O 2 toxicity, but itself caused toxicity at the high doses.